Over the past couple of days the school where I serve as Director of Technology has received many emails that originated from the TAGGED.COM or TAGGEDMAIL.COM website. This is a social network site for sharing photos that seems harmless on the surface. However if you read their terms of service it clearly says;
E) Notice Regarding Commercial Email
MEMBERS CONSENT TO RECEIVE COMMERCIAL E-MAIL MESSAGES FROM TAGGED, AND ACKNOWLEDGE AND AGREE THAT THEIR EMAIL ADDRESSES AND OTHER PERSONAL INFORMATION MAY BE USED BY TAGGED FOR THE PURPOSE OF INITIATING COMMERCIAL E-MAIL MESSAGES.
What does this mean? It means that members acknowledge that your personal information may (read WILL and IS) be used for the purpose of "initiating commercial e-mail messages" (i.e. sending spam to all your contacts).
I am VERY STRONGLY recommending that you DO NOT use, visit, or sign up on the TAGGED.COM website. Not only is this a security risk for you but it is also an extremely invasive method of marketing that puts both your and your friends' personal information at risk.
If you are looking for quality photo sharing sites, here are a few I would recommend (in no particular order) as well as a couple of links to photo site reviews:
Flickr
SmugMug
Photobucket
PicasaWeb
Lifehacker.com review
All Things Digital review